BUG: CINDI ram velocity cleaning
BUG: CINDI ram velocity cleaning

Fixed the bug in the Burrell, 2012 selection criteria.  Also cleaned up a few other
areas:
- Removed unnecessary try/except statement,
- Added comment about appropriateness of meridional velocity cut, and
- Changed selection level of Burrell, 2012 criteria since only part of the criteria
  are dependent on the RPA flag.

rstoneback/pysat,jklenzing/pysat